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#include <iostream>
using namespace std;
 
class B
{
	public:
	virtual void f() { std::cout << "B::f" << std::endl; }
};
 
class D : public B
{
	public:
//	virtual void f() { std::cout << "D::f" << std::endl; }
	virtual void f() override;
	private:
//		using B::f;
};
 
int main() {
	// your code goes here
	D* d1 = new D();
//	d1->f();
//	static_cast<B*>(d1)->f();
//	B* d2 = new D();
//	d2->f();
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:21:5: warning: unused variable ‘d1’ [-Wunused-variable]
  D* d1 = new D();
     ^
/home/LY5jX6/cclJMGf6.o: In function `main':
prog.cpp:(.text.startup+0x17): undefined reference to `vtable for D'
collect2: error: ld returned 1 exit status

Standard output is empty